1154 - Quantitative Analysis of the Head Tilt Using 3-D Temporal Scan in Children with Torticollis

Objectives: With development of three-dimensional (3D) scanning technology, it became possible to promptly capture the head and neck deviation quantitatively and this study aimed to objectively demonstrate head tilt through clinical measurements and 3D scanning in young children

Design: We performed cross-sectional study using the data of 52 patients diagnosed with torticollis and 52 adults without torticollis to set the reference value. Still photography method measuring the angle formed by the line connecting two eyes and the line connecting the acromion and 3D scan method. Intra-class correlation (ICC) coefficient was used to compare three method measurements’ reliability and Pearson's correlation analysis was conducted between goniometer measurements and 3D angle using a 3D scanner. The Mann-Whitney U test was performed for comparing patient groups to control groups and receiver operating characteristic (ROC) curve was used to determine the cut-off value for diagnosing torticollis.

Results: The average angle differences between control group and torticollis group showed significant differences by using any methods. Reliabilities of torticollis between measurements were all statistically significant using ICC method. Correlation coefficient between the goniometer method and 3D angle was 0.720 (p< 0.001), and between still photography method and 3D angle was 0.727 (p< 0.001). For the diagnosis of torticollis using the 3D angle, the cut-off value was 4.950, the sensitivity was 0.788 and 1-specificity was 0.212 obtained through the ROC curve. The area under curve was 0.872.

Conclusions: This is the first study to obtain head tilting, rotation, vertical and combined 3D angles using a 3D scanner. Compared with that of the control group, the 3D angle value was significantly larger in the patient group and showed high correlation with other measurement methods. With further research, it is thought that torticollis can be evaluated three-dimensionally and the values can be used in clinical practice.